Adding Point Markers

Adding point markers

Your map is empty so far – so let's add some markers. To do so, you first need to understand the difference between the properties and the data when it comes to locator maps:

  • https://api.datawrapper.de/v3/charts/<ID>/data entails all information about markers: marker symbols, marker text, marker text formatting, coordinates, connector lines. In Datawrapper's editor, that's everything you set in step 1: Add markers.
  • https://api.datawrapper.de/v3/charts/<ID> entails all information about the general map, like the settings for the title, inset map, the zoom and design of your locator map. In Datawrapper's editor, that's everything you set in step 2: Design map and step 3: Annotate.

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Every time you upload data, it overwrites the old data file

To add a marker, you'll need to upload information about them with a PUT request. This will replace your data file. The PUT request needs to entail all the markers you'd like to see on the map.

Let's use the following PUT request to add the first marker to the map:

curl --request PUT \
     --url https://api.datawrapper.de/v3/charts/<ID>/data \
     --header 'Authorization: Bearer <YOUR_TOKEN_HERE>' \
     --header 'content-type: text/csv' \
     --data '{
  "markers": [
    {
      "type": "point",
      "title": "Buckingham Palace",
      "icon": {
        "path": "M1000 350a500 500 0 0 0-500-500 500 500 0 0 0-500 500 500 500 0 0 0 500 500 500 500 0 0 0 500-500z",
        "height": 700,
        "width": 1000
      },
      "scale": 1,
      "markerColor": "#cc0000",
      "anchor": "bottom-right",
      "offsetY": 0,
      "offsetX": 0,
      "text": {
        "color": "#333333",
        "fontSize": 15,
        "halo": "#f2f3f0"
      },
      "rotate": 0,
      "visible": true,
      "visibility": {
        "mobile": true,
        "desktop": true
      },
      "coordinates": [
        -0.140634,
        51.501476
      ]
    }
  ]
}'

There are many more properties you can define – but let's look at these basic ones in detail:

Point marker properties

Name

Type

Description

type

String

Defines if the marker is a point, area or line marker.

title

String

Marker text (displayed next to the marker symbol). You can use HTML tags like <strong> or <br> in the marker text.

icon.path

String

SVG path of the marker symbol. To get the SVG path of a certain marker, create a locator map in the Datawrapper app and use a GET request.

icon.height

Number

Height of the marker symbol

icon.width

Number

Height of the marker symbol

scale

Number

Size of the marker symbol. The bigger the number, the bigger the symbol.

markerColor

String

Color of the marker symbol.

anchor

String

Defines where the marker text sits relative to the marker symbol. Possible options: bottom-left, bottom-center, bottom-right, middle-left, middle-center, middle-right, top-left, top-center, top-right.

offsetY

Number

Vertical distance between the marker text and the marker symbol (can be a negative value).

offsetX

Number

Horizontal distance between the marker text and the marker symbol (can be a negative value).

text.color

String

Color of the marker text. Default: #333333.

text.fontSize

Number

Font size of the marker text. Default: 14.

text.halo

String

Outline around the marker text. Default: #f2f3f0

rotate

Number

Defines the rotation of the marker text. Default: 0.

visible

Boolean

When true, the marker is visible.

visibility.mobile

Boolean

When true, the marker is visible on mobile devices.

visibility.desktop

Boolean

When true, the marker is visible on desktop devices.

coordinates

Array of numbers

Coordinates of the marker, e.g. [-74.00597073114699, 40.71217116089093].

Result

The resulting map will look like this: